Transformer.



G. A. BURNHAM. TRANSFORIVIER.

. APPLICATON FILED SEPT. 28.1916. 1,293,692. Patnted Feb. 11, 1919.

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TRANSFORMER.

Y APPLICATION FILED SEIU-.28,1915 I 1,293,692. Iauted Feb. 1l, 1919.

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a amargas man: n u Jah v To @ZZ ltlf/'wm' t may concern l 'i I Be it known that L -Geenen si. BURNHAM, a citizen of the UnitedStates, residing at Sangue, in the countyof Essenand State ot Massachusetts, have invented an lmprovement in Transformers, of which the following is a specification.-

-'ll`his invention relates totransformers. 1n the construction of transformers it `is coinmon to provide a core composed of a plurality of contiguouslyY disposed annular plates and secondary windings arranged on the means for attaching ther transformer Ato a *switch-board, with .its center opening which receives the primary conductor orwinding, arranged at right angles to its support,'or'1n parrallel relation therewith, thus adapt-ing the transformer kinds.

Figure 1 is a side elevation of a transformer, and supporting means therefor, emA

bodying this invention.

. F ig. 2is' a plan View of thesame.

. Fig. 3 is a IerticalV section of the transformer taken on the dotted lineS-3,'Fjig. 1.

Figs. 11 and 5 are details of the clampingmeans for the core'components';

to supports. of various Fig. 6 isa sectional detail of the clamping-means." Fig. 7 is a plan-view of an attaching- Fig.- 8 is aside elevation of the transformer arranged 'in `parallel relation with its support.

Fig. 9 is a fragmentary view. illustrating a transformer. arranged at right angles toits support.

10 represents the annular core of the transformer, which is composed of a plurality of contiguously disposed like flat annular plates, of iron orother magnetic material, and 12, 12, represent the secondary windings thereon, arranged at diametrically opposite places, said windings being connected 55 electrically in series relation by a conductor vtipeeincaton of LLetters Eatent. l v Application iled September 2S, 1916. Serial No. 122,27??

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13,' and having terminal conductors 14, 1l, adapted for connection in an electric circuit. he flat sheet metal rings composing the core have, at their outer edges,- shouldered portions 11, with straight edges, said shouldered portions being oppositely disposed, on the core between the windings; and also have recesses 11, at their inner edges opposite the shouldered portions.

My improved clamping-means for the core components is arranged at such por.- tions of the core, between the windings thereof, and each consists of a clampingelem'ent, see' Figs. 4 and 5, composed of a sheet metal plate, which is bent transversely on two parallel lines to form an intermediate portion 15., and two end-portions 16, 16.

. The intermediate portion 15 is of a length co-'extensive with the width of the assembled core components, and is adapted to overlie and engage the shouldered portions thereof. The end-portions 16, 16, are adapted to eX- tend over the opposite sides of the core so that the core is received and held between' lsaid end-portions. The lendportions each have intermediately disposed thereon a 'tongue 18. The tongues -18 are adapted to be disposed over the recesses 11'a in the inner edge of the core, and to be bent angularlyand extended into said recesses, thus to clamp the plate to the core.

The shouldered portions of the` core components, when the latter are assembled, provide flat surfaces to receiveupon'them the intermediate portions 15 of the clampingelements .The intermediate portion of one or both of said clamping-elements is provided with holes 30, adapted to receivethe attaching-screws 31, for the transformer,

which screws extend through an attachingplate 32, having slots or holesat its ends.

`which may receive U-bolts 33, adapted to embrace a pipe-support','see Figs. 1, 2 and 8, or may receive bolts' 34, see Fig. 9, adapted to engage a. switch-board, although it is obvious that other means may be provided for attaching the transformer to its support. An important feature in connection with the attaching-means consists in providing the intermediate portion of the clampingelement witli holes adapted to receive screws extended from the attaching plate when the transformer is arranged in parallel relation with its support, see Fig. 8, or at right angles thereto, .see Fig. 9. This provision v1s easily made for, as here shown, thereare four holes arrangedm vthe intermediate portion of the clamping-element in the form of asquare, and the same .attaching screws may engage said holes with'the transformer arranged in either position shown. In lieu of this arrangement and number of holes,` any c case comprises a tubularcylindrical portion adapted to fltsm'ig y over or upon the ends vl5 40, and two end ca s 41, 4l, having flanges of the tuibulanend-portions." These end-caps have holes VAprovided with bushings 45,

- through Whichthe conductors leading from the windings may pass.'y The end-caps. are adapted tobe held in fixed relation on the tubular portion. Said inclosing-case has a flattened portion 50, at one side, arranged opposite the shouldered portions of the core components, which .is adapted to engage the attaching-plate, tlie attaching screws being thecore, and two end-portions adapted to extend over the sides ofthe core, and in-' extended through holes in said flattened por`- 4tion when the transformer" is attached to its support, `as well 'as into or through the clamping-means for' the core-components. I claim Y l. A transformer comprising angannular corewith windings thereon, ysaid core comprising" a plurality of metallic plates, and clamping-means arranged between the windings for holding said plates assembled, consistingvof a plate, bent to form an intermediate portion co-extensive with the width of Wardly extended tongues which engage the inner edge of the-core.

l 2. Atransformer comprising an annular core with windings thereon, said core comprising a plurality of metallic plates, having flat shouldered portions at their outer edges, and clamping-means arranged on said core, between the windings, for holding the components thereof assembled, which en-. gage the shouldered portionsthereof.

3. A transformer comprising ancannular core with windings thereon, said core comprising a vplurality of metallic plates having recesses at their inner edges, and clampbetween the windings, having tongues which extend intosaid recesses.

, il.. A transformer comprising an annular core withwindings thereon, said core 'comp prising a plurality offlat metallic plates having flat shouldered portions -at their outer edges, and recesses at their inner edges arranged between the windings, and clamp-v ing-elements embracing the core components, having intermediate portions which engage the'shouldered portions'and tongues which enter the recesses. l v

5. A transformer havingan annular core composed of aplurality of contiguously disposed metallic plates,vclamping means, for said plates having a flattened portion, an inclosing case forv the transformer having a flattened portion to register with the fiattened portion of the clamping means, an attaching plate having a flattened -portion 'against which the flattened portion-of the inclosing case is adapted to rest, the flattened portions of the clamping means, inclosing case and attaching plate being provided with equally spaced holes therein to permit the transformer to be attached tothe attaching plate in a plurality of positions, and attachingscrews adapted to enter the holes in this clamping means, inclosing case and attaching plate to secure said elements together.

6. A transformer, an annular core composed of a pluralityof metallic plates contiguously disposed, clamping-means 'for holding said plates assembled having a fiat intermediate portion provided with holes for the attaching-screws, an attachingplate and attaching-screws and a cylindrical inclosing-case for the transformer having flattened portion adapted to rest against- GEORGE A. BUI'anal/iM.l

Witnesses H. S. RAMSAY, D. M. SCHIFFERT.'

vingmeans embracing the core components, 

